USA Standard ring & pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring & pinion sets for a variety of common & hard to find applications. USA standard gear offers a standard one year warranty against defects on their ring & pinion sets. Product Features:Fits 1993 - 1999 Ford 10.2510.25 ring gear diameter31 spline pinion12 ring gear bolts5.38 ratio